Hilary Duff, Haylie bike pilates Grateful dead

Does she ever take a day off?

Hilary Duff continued her routine of prenatal pilates, stopping by her fave studio in Toluca Lake on Friday.

The sweaty mama-to-be, dressed rocker chic in a Grateful Dead tee and leggings, clearly had a good workout -- and some good company! Big sister Haylie was spotted walking her bicycle alongside Hil after the exercise class.

Despite her exercise routine, Hilary, 23, seems to be going a bit stir crazy. Hil Tweeted earlier this week that'd she's picked up painting as a new hobby. She's only had one lesson so far, but she seems very excited about it!

Sounds fun to us!